Start Session Ready Message.
This is the first command to be sent after a connection has been requested, indicating that the application is communicating with another OFTP.
Start Session IDentification.
This is a request for initiate a session. It contains information such user and password of the requester.
Start File Identification.
This is a request for permission to send a file. It contains information such as the origin and destination of the file, its name and physical size.
Start File Positive Answer.
This is a positive acknowledgement for SFID request. Transfer is accepted.
Start File Negative Answer.
This is a negative acknowledgement for SFID request. Transfer is rejected.
The actual file data sent to the trading partner.
Service command for flow control.
End of File IDentification.
This command is sent immediately after the file has been transferred containing control totals to ensure the integrity of the sent file.
End File Positive Answer.
This is a positive acknowledgement for EFID request. Transfer is succesfully completed.
End File Negative Answer.
This is a negative acknowledgement for EFID request. Transfer is cancelled.
End to End ResPonse.
The EERP is generated when a file reaches its ultimate destination. It is sent to the originator of the file to inform them that the file has been received.
Negative End ResPonse.
The NERP is generated when a file cannot be transmitted to its ultimate destination. It is sent to the originator of the file to inform them that the file cannot be transmitted
End of Session IDentification.
The ESID requests that the communication session be terminated.
The CD command gives token to partner.
Ready To Receive.
The RTR command is an acknowledgement for EERP. It permits flow control.
Security Change Direction
The SECD command asks partner to send an AUCH command. It is used for initializing authentication sequence.
Authentication Challenge .
AUCH command is sending of an authentication challenge, i.e a random string encrypted wit partner's public key. It is used for strong authentication...
AURP command is the answer to AUCH; command carries the decrypted challenge
Update : 2011-02-15 .